xhci: translate virtual addresses into the bus's address space

So far we've been content with passing physical addresses when
configuring memory addresses into XHCI controllers, but not all
platforms have buses with transparent mappings. Specifically the
Raspberry Pi 4 might introduce an offset to memory accesses incoming
from its PCIe port.

Introduce xhci_virt_to_bus() and xhci_bus_to_virt() to cater with these
limitations, and make sure we don't break non DM users.

Change-Id: Ifde02ea1633e2fb741793b95102a9ce866028921
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Peter Robinson <pbrobinson@gmail.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 4c303ae..39a5574 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -110,7 +110,7 @@ static void xhci_scratchpad_free(struct xhci_ctrl *ctrl)
 
        ctrl->dcbaa->dev_context_ptrs[0] = 0;
 
-       free((void *)(uintptr_t)le64_to_cpu(ctrl->scratchpad->sp_array[0]));
+       free(xhci_bus_to_virt(ctrl, le64_to_cpu(ctrl->scratchpad->sp_array[0])));
        free(ctrl->scratchpad->sp_array);
        free(ctrl->scratchpad);
        ctrl->scratchpad = NULL;
@@ -216,8 +216,8 @@ static void *xhci_malloc(unsigned int size)
  * @param link_trbs    flag to indicate whether to link the trbs or NOT
  * @return none
  */
-static void xhci_link_segments(struct xhci_segment *prev,
-                               struct xhci_segment *next, bool link_trbs)
+static void xhci_link_segments(struct xhci_ctrl *ctrl, struct xhci_segment *prev,
+                              struct xhci_segment *next, bool link_trbs)
 {
        u32 val;
        u64 val_64 = 0;
@@ -226,7 +226,7 @@ static void xhci_link_segments(struct xhci_segment *prev,
                return;
        prev->next = next;
        if (link_trbs) {
-               val_64 = virt_to_phys(next->trbs);
+               val_64 = xhci_virt_to_bus(ctrl, next->trbs);
                prev->trbs[TRBS_PER_SEGMENT-1].link.segment_ptr =
                        cpu_to_le64(val_64);
 
@@ -305,7 +305,8 @@ static struct xhci_segment *xhci_segment_alloc(void)
  * @param link_trbs    flag to indicate whether to link the trbs or NOT
  * @return pointer to the newly created RING
  */
-struct xhci_ring *xhci_ring_alloc(unsigned int num_segs, bool link_trbs)
+struct xhci_ring *xhci_ring_alloc(struct xhci_ctrl *ctrl, unsigned int num_segs,
+                                 bool link_trbs)
 {
        struct xhci_ring *ring;
        struct xhci_segment *prev;
@@ -328,12 +329,12 @@ struct xhci_ring *xhci_ring_alloc(unsigned int num_segs, bool link_trbs)
                next = xhci_segment_alloc();
                BUG_ON(!next);
 
-               xhci_link_segments(prev, next, link_trbs);
+               xhci_link_segments(ctrl, prev, next, link_trbs);
 
                prev = next;
                num_segs--;
        }
-       xhci_link_segments(prev, ring->first_seg, link_trbs);
+       xhci_link_segments(ctrl, prev, ring->first_seg, link_trbs);
        if (link_trbs) {
                /* See section 4.9.2.1 and 6.4.4.1 */
                prev->trbs[TRBS_PER_SEGMENT-1].link.control |=
@@ -355,6 +356,7 @@ static int xhci_scratchpad_alloc(struct xhci_ctrl *ctrl)
        struct xhci_hccr *hccr = ctrl->hccr;
        struct xhci_hcor *hcor = ctrl->hcor;
        struct xhci_scratchpad *scratchpad;
+       uint64_t val_64;
        int num_sp;
        uint32_t page_size;
        void *buf;
@@ -372,8 +374,9 @@ static int xhci_scratchpad_alloc(struct xhci_ctrl *ctrl)
        scratchpad->sp_array = xhci_malloc(num_sp * sizeof(u64));
        if (!scratchpad->sp_array)
                goto fail_sp2;
-       ctrl->dcbaa->dev_context_ptrs[0] =
-               cpu_to_le64((uintptr_t)scratchpad->sp_array);
+
+       val_64 = xhci_virt_to_bus(ctrl, scratchpad->sp_array);
+       ctrl->dcbaa->dev_context_ptrs[0] = cpu_to_le64(val_64);
 
        xhci_flush_cache((uintptr_t)&ctrl->dcbaa->dev_context_ptrs[0],
                sizeof(ctrl->dcbaa->dev_context_ptrs[0]));
@@ -394,8 +397,8 @@ static int xhci_scratchpad_alloc(struct xhci_ctrl *ctrl)
        xhci_flush_cache((uintptr_t)buf, num_sp * page_size);
 
        for (i = 0; i < num_sp; i++) {
-               uintptr_t ptr = (uintptr_t)buf + i * page_size;
-               scratchpad->sp_array[i] = cpu_to_le64(ptr);
+               val_64 = xhci_virt_to_bus(ctrl, buf + i * page_size);
+               scratchpad->sp_array[i] = cpu_to_le64(val_64);
        }
 
        xhci_flush_cache((uintptr_t)scratchpad->sp_array,
@@ -485,9 +488,9 @@ int xhci_alloc_virt_device(struct xhci_ctrl *ctrl, unsigned int slot_id)
        }
 
        /* Allocate endpoint 0 ring */
-       virt_dev->eps[0].ring = xhci_ring_alloc(1, true);
+       virt_dev->eps[0].ring = xhci_ring_alloc(ctrl, 1, true);
 
-       byte_64 = virt_to_phys(virt_dev->out_ctx->bytes);
+       byte_64 = xhci_virt_to_bus(ctrl, virt_dev->out_ctx->bytes);
 
        /* Point to output device context in dcbaa. */
        ctrl->dcbaa->dev_context_ptrs[slot_id] = cpu_to_le64(byte_64);
@@ -523,15 +526,15 @@ int xhci_mem_init(struct xhci_ctrl *ctrl, struct xhci_hccr *hccr,
                return -ENOMEM;
        }
 
-       val_64 = virt_to_phys(ctrl->dcbaa);
+       val_64 = xhci_virt_to_bus(ctrl, ctrl->dcbaa);
        /* Set the pointer in DCBAA register */
        xhci_writeq(&hcor->or_dcbaap, val_64);
 
        /* Command ring control pointer register initialization */
-       ctrl->cmd_ring = xhci_ring_alloc(1, true);
+       ctrl->cmd_ring = xhci_ring_alloc(ctrl, 1, true);
 
        /* Set the address in the Command Ring Control register */
-       trb_64 = virt_to_phys(ctrl->cmd_ring->first_seg->trbs);
+       trb_64 = xhci_virt_to_bus(ctrl, ctrl->cmd_ring->first_seg->trbs);
        val_64 = xhci_readq(&hcor->or_crcr);
        val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) |
                (trb_64 & (u64) ~CMD_RING_RSVD_BITS) |
@@ -552,7 +555,7 @@ int xhci_mem_init(struct xhci_ctrl *ctrl, struct xhci_hccr *hccr,
        ctrl->ir_set = &ctrl->run_regs->ir_set[0];
 
        /* Event ring does not maintain link TRB */
-       ctrl->event_ring = xhci_ring_alloc(ERST_NUM_SEGS, false);
+       ctrl->event_ring = xhci_ring_alloc(ctrl, ERST_NUM_SEGS, false);
        ctrl->erst.entries = xhci_malloc(sizeof(struct xhci_erst_entry) *
                                         ERST_NUM_SEGS);
 
@@ -561,8 +564,8 @@ int xhci_mem_init(struct xhci_ctrl *ctrl, struct xhci_hccr *hccr,
        for (val = 0, seg = ctrl->event_ring->first_seg;
                        val < ERST_NUM_SEGS;
                        val++) {
-               trb_64 = virt_to_phys(seg->trbs);
                struct xhci_erst_entry *entry = &ctrl->erst.entries[val];
+               trb_64 = xhci_virt_to_bus(ctrl, seg->trbs);
                entry->seg_addr = cpu_to_le64(trb_64);
                entry->seg_size = cpu_to_le32(TRBS_PER_SEGMENT);
                entry->rsvd = 0;
@@ -571,7 +574,7 @@ int xhci_mem_init(struct xhci_ctrl *ctrl, struct xhci_hccr *hccr,
        xhci_flush_cache((uintptr_t)ctrl->erst.entries,
                         ERST_NUM_SEGS * sizeof(struct xhci_erst_entry));
 
-       deq = virt_to_phys(ctrl->event_ring->dequeue);
+       deq = xhci_virt_to_bus(ctrl, ctrl->event_ring->dequeue);
 
        /* Update HC event ring dequeue pointer */
        xhci_writeq(&ctrl->ir_set->erst_dequeue,
@@ -586,7 +589,7 @@ int xhci_mem_init(struct xhci_ctrl *ctrl, struct xhci_hccr *hccr,
        /* this is the event ring segment table pointer */
        val_64 = xhci_readq(&ctrl->ir_set->erst_base);
        val_64 &= ERST_PTR_MASK;
-       val_64 |= virt_to_phys(ctrl->erst.entries) & ~ERST_PTR_MASK;
+       val_64 |= xhci_virt_to_bus(ctrl, ctrl->erst.entries) & ~ERST_PTR_MASK;
 
        xhci_writeq(&ctrl->ir_set->erst_base, val_64);
 
@@ -854,7 +857,7 @@ void xhci_setup_addressable_virt_dev(struct xhci_ctrl *ctrl,
                        cpu_to_le32(((0 & MAX_BURST_MASK) << MAX_BURST_SHIFT) |
                        ((3 & ERROR_COUNT_MASK) << ERROR_COUNT_SHIFT));
 
-       trb_64 = virt_to_phys(virt_dev->eps[0].ring->first_seg->trbs);
+       trb_64 = xhci_virt_to_bus(ctrl, virt_dev->eps[0].ring->first_seg->trbs);
        ep0_ctx->deq = cpu_to_le64(trb_64 | virt_dev->eps[0].ring->cycle_state);
 
        /*

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index ee7f58e..9cbce79 100644 (file)
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -275,10 +275,13 @@ void xhci_queue_command(struct xhci_ctrl *ctrl, u8 *ptr, u32 slot_id,
                        u32 ep_index, trb_type cmd)
 {
        u32 fields[4];
-       u64 val_64 = virt_to_phys(ptr);
+       u64 val_64 = 0;
 
        BUG_ON(prepare_ring(ctrl, ctrl->cmd_ring, EP_STATE_RUNNING));
 
+       if (ptr)
+               val_64 = xhci_virt_to_bus(ctrl, ptr);
+
        fields[0] = lower_32_bits(val_64);
        fields[1] = upper_32_bits(val_64);
        fields[2] = 0;
@@ -399,7 +402,7 @@ void xhci_acknowledge_event(struct xhci_ctrl *ctrl)
 
        /* Inform the hardware */
        xhci_writeq(&ctrl->ir_set->erst_dequeue,
-                   virt_to_phys(ctrl->event_ring->dequeue) | ERST_EHB);
+                   xhci_virt_to_bus(ctrl, ctrl->event_ring->dequeue) | ERST_EHB);
 }
 
 /**
@@ -577,7 +580,7 @@ int xhci_bulk_tx(struct usb_device *udev, unsigned long pipe,
        u64 addr;
        int ret;
        u32 trb_fields[4];
-       u64 val_64 = virt_to_phys(buffer);
+       u64 val_64 = xhci_virt_to_bus(ctrl, buffer);
        void *last_transfer_trb_addr;
        int available_length;
 
@@ -728,7 +731,7 @@ again:
        }
 
        if ((uintptr_t)(le64_to_cpu(event->trans_event.buffer)) !=
-           (uintptr_t)virt_to_phys(last_transfer_trb_addr)) {
+           (uintptr_t)xhci_virt_to_bus(ctrl, last_transfer_trb_addr)) {
                available_length -=
                        (int)EVENT_TRB_LEN(le32_to_cpu(event->trans_event.transfer_len));
                xhci_acknowledge_event(ctrl);
@@ -888,7 +891,7 @@ int xhci_ctrl_tx(struct usb_device *udev, unsigned long pipe,
        if (length > 0) {
                if (req->requesttype & USB_DIR_IN)
                        field |= TRB_DIR_IN;
-               buf_64 = virt_to_phys(buffer);
+               buf_64 = xhci_virt_to_bus(ctrl, buffer);
 
                trb_fields[0] = lower_32_bits(buf_64);
                trb_fields[1] = upper_32_bits(buf_64);

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 0b95efc..76a4956 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -606,7 +606,7 @@ static int xhci_set_configuration(struct usb_device *udev)
                ep_ctx[ep_index] = xhci_get_ep_ctx(ctrl, in_ctx, ep_index);
 
                /* Allocate the ep rings */
-               virt_dev->eps[ep_index].ring = xhci_ring_alloc(1, true);
+               virt_dev->eps[ep_index].ring = xhci_ring_alloc(ctrl, 1, true);
                if (!virt_dev->eps[ep_index].ring)
                        return -ENOMEM;
 
@@ -631,7 +631,7 @@ static int xhci_set_configuration(struct usb_device *udev)
                        cpu_to_le32(MAX_BURST(max_burst) |
                        ERROR_COUNT(err_count));
 
-               trb_64 = virt_to_phys(virt_dev->eps[ep_index].ring->enqueue);
+               trb_64 = xhci_virt_to_bus(ctrl, virt_dev->eps[ep_index].ring->enqueue);
                ep_ctx[ep_index]->deq = cpu_to_le64(trb_64 |
                                virt_dev->eps[ep_index].ring->cycle_state);
 

diff --git a/include/usb/xhci.h b/include/usb/xhci.h
index 75b374c..25d5bba 100644 (file)
--- a/include/usb/xhci.h
+++ b/include/usb/xhci.h
@@ -16,6 +16,7 @@
 #ifndef HOST_XHCI_H_
 #define HOST_XHCI_H_
 
+#include <phys2bus.h>
 #include <reset.h>
 #include <usb.h>
 #include <asm/types.h>
@@ -1230,6 +1231,12 @@ struct xhci_ctrl {
        int rootdev;
 };
 
+#if CONFIG_IS_ENABLED(DM_USB)
+#define xhci_to_dev(_ctrl)     _ctrl->dev
+#else
+#define xhci_to_dev(_ctrl)     NULL
+#endif
+
 unsigned long trb_addr(struct xhci_segment *seg, union xhci_trb *trb);
 struct xhci_input_control_ctx
                *xhci_get_input_control_ctx(struct xhci_container_ctx *ctx);
@@ -1259,7 +1266,8 @@ int xhci_check_maxpacket(struct usb_device *udev);
 void xhci_flush_cache(uintptr_t addr, u32 type_len);
 void xhci_inval_cache(uintptr_t addr, u32 type_len);
 void xhci_cleanup(struct xhci_ctrl *ctrl);
-struct xhci_ring *xhci_ring_alloc(unsigned int num_segs, bool link_trbs);
+struct xhci_ring *xhci_ring_alloc(struct xhci_ctrl *ctrl, unsigned int num_segs,
+                                 bool link_trbs);
 int xhci_alloc_virt_device(struct xhci_ctrl *ctrl, unsigned int slot_id);
 int xhci_mem_init(struct xhci_ctrl *ctrl, struct xhci_hccr *hccr,
                  struct xhci_hcor *hcor);
@@ -1289,4 +1297,14 @@ struct xhci_ctrl *xhci_get_ctrl(struct usb_device *udev);
 
 extern void xhci_pci_fixup(struct udevice *dev);
 
+static inline dma_addr_t xhci_virt_to_bus(struct xhci_ctrl *ctrl, void *addr)
+{
+       return dev_phys_to_bus(xhci_to_dev(ctrl), virt_to_phys(addr));
+}
+
+static inline void *xhci_bus_to_virt(struct xhci_ctrl *ctrl, dma_addr_t addr)
+{
+       return phys_to_virt(dev_bus_to_phys(xhci_to_dev(ctrl), addr));
+}
+
 #endif /* HOST_XHCI_H_ */